Rain closes roads, power out as 100mm falls in parts of Sydney

Manly Fast Ferry and F1 services were cancelled on Monday morning due to the weather conditions. Replacement bus services were running between Manly at the city. Ferry services between Parramatta and Rydalmere were also cancelled and replaced with buses due to the weir overflowing.

Central Coast Line train services were delayed by up to 15 minutes after the heavy rain activated track safety monitors at Wondabyne

Meanwhile, Ausgrid crews restored power in South Turramurra, Turramurra and West Pymble on the upper north shore on Monday morning, while crews are continuing to work at Avalon Beach, Bilgola and Bilgola Plateau on the northern beaches.

The disruption comes as some areas of the city's upper north shore and northern beaches recorded more than 100 millimetres over the past three days as a low pressure system brought a wet end to a previously dry October.

At Wahroonga, about 115 millimetres has fallen since showers began on Friday evening. Most of the rain came on Sunday, with 76 millimetres falling between 9am on Sunday and 6.30am on Monday.

Nearby in Hornsby, there were similar totals: the suburb got 75 millimetres since 9am on Sunday for a total of 112 millimetres over the course of the downpour.

On the northern beaches, 73 millimetres fell at Terrey Hills since 9am on Sunday and 112 millimetres was recorded across the weekend.

Consistent rain also fell in the city and eastern suburbs. At Little Bay 40 millimetres was recorded on Sunday, bringing the total to 96 millimetres as of 6.30am.

The State Emergency Service has responded to more than 400 calls for assistance since Friday – more than 150 of which were in the Sydney and Blue Mountains area.

Most callouts were for leaking roofs and downed trees, an SES spokesperson said.

Volunteers responded to three flood rescues at the weekend, including of two horses stuck in rapidly rising waters at Ourimbah on the Central Coast and a man in his ute at Tumbarumba in the state's south-west.

The spokesperson reminded residents not to walk, drive or ride through floodwaters, to drive to conditions and to keep cars parked under cover, away from trees and power poles.

Light rain is forecast for Sydney until Friday, although conditions are expected to ease significantly on Monday evening and little rain is forecast on Tuesday.

"The falls will continue with windy and wet conditions. [But] by this afternoon and evening, as the system moves to the east, the rainfall will be easing," Bureau of Meteorology forecaster Shuang Wang said.

A gale wind warning is in place for Sydney's coast and the Hunter and Illawarra coasts on Monday. A strong wind warning is in place for Sydney's closed waters. A hazardous surf warning is also in place.

Outside Sydney, the highest falls were seen in the Central Coast to Newcastle region, where some areas received more than 200 millimetres over the weekend. Mount Elliott recorded 202 millimetres over the weekend, 146 millimetres of which fell on Sunday.

A severe weather warning was in place for parts of the Hunter on Monday, with heavy rainfall that may lead to flash flooding possible during the morning and wind gusts of up to 90km/h possible on the coast.